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Patented Nov. 9, 1926. i f

UNITED STATES 1,605,953 PATENT OFFICE.

CHARLES H. HOW'ARD, OF SA'UG'US, MASSACHUSETTS, :ASSIGNOR TO PAPER PRODUCTS MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

REENFORCED CORRUGATED PAPER.

broken, so that it is necessary to protect the same.

The present invention, therefore, relates to a reenforced corrugated paper which possesses the usual buffing quality of ordinary corrugated paper, and in addition thereto possesses sufiicient strength and toughness to form a durable outer wrapper for packages. As a result of the present invention a single wrapper formed of reenforced corrugated paper may be used in place of the two wrappoi-s required heretofore, consisting of corrugated paper protected by a separate and independent outer wrapper.

Corrugated paper, in accordance with the present invention, is reenforced by applying to its outer surface a facing sheet, preferably formed of a two ply sheet of paper having unspun fibres applied in a thin layer between the two sheets, and the fibres are preferably secured to the sheets by a waterproof adhesive to prevent the wrapper and the contents of the container from being injured by moisture. lVhere additional strength is desired the inner surface of the corrugated sheet may be provided with a similar sheet of reenforced paper.

The reenforcing unspun fibres are applied between the sheets of paper in a straightened condition with the fibres lying in substantially parallel relation, and the unspun fibres may be applied longitudinally or transversely of the paper to which they are secured, or one layermay be applied longitudinally and another layer transversely to reenforce the paper both longitudinally and transversely.

The reenforced corrugated paper of the present invention is admirably adapted for the formation of boxes or cartons, because the corrugated paper aifords the vrequired stiffness for the walls of the box, while the reenforced paper gives the walls the requisite strength and toughness. It also forms an excellent wrapping material for bundles where a stiff protecting wrapper is desired as the reenforced corrugated paper may be bent and folded without breaking or tearing.

The character of the invention may be best understood by reference to the following description n connection with the accompanying drawings, wherein:

Fig. 1 1s a perspective view of a box consisting of an inner section and a telescoping outer section both constructed of reenforced corrugated paper;

Fig. 2 is a perspective view of the reenforced corrugated paper of the present invention with the facing sheets turned back and having one facing sheet formed of reenforced paper and the other facing sheet formed of plain paper;

Fig. 3 is a modification of Fig. 2 showing the facing sheet of plain paper omitted;

Fig. 4. is a further modification of Fig. 2 showing both facing sheets formed of reenforced paper; and

Fig. 5 is a perspective view of a box formed of the box sections of Fig. 1.

'Referring to the drawings, and more particularly to Fig. 2, 10 designates a sheet of corrugated paper which may be of usual construction, and adhesively secured to the outer face of the corrugated paper 10 is a facing sheet 11 formed of reenforced paper, while applied to the inner face of the corrugated paper 10 is a facing sheet 12 of plain paper.

The facing sheet 11 is shown as a two-ply sheet consisting of the sheets 13 and 14, and interposed between these sheets are the unspun reenforcing fibres. The unspun fibres are arranged in substantially parallel relation, and one layer of fibres 15 is applied transversely of the paper to be reenforced while a second layer 16 is applied longitudinally of the paper. The layers of reenforcing fibres are adhesively secured between the sheets 13 and 14, and a-water-proof adhesive such as asphaltum preferably is employed to exclude moisture from the corrugated paper 10 and from the contentsof the box or packa 'e.

The reenforced corrugated paper of Fig. 3 is similar to that shown in Fig. 2 except that the plain facing sheet 12 has been omitted.

tional strength is desired they may be reen- In Fig. 4 a sheet of reenforoed corrugated paper is shown as formed of a corrugated sheet 10 having a facing sheet 17 applied to its outer face and a facing sheet 18 applied to its inner face. The facing sheets 17 and 18 are shown as formed of two-ply sheets, consisting of paper strlps 1S? and 20 having a layer of fi res 21 adhesively secured between them and extending 1n substantially parallel relation. The sheets 17 and 18 are shown as reenforced by fibres extending in one direction only, but it Will be understood that the facing sheets may be reenforced either longitudinally or transversely by the unspun fibres, and 1f addiforced both longitudinall and transversely.

Reenforced corrugat paper such as shown in Figs. 2, 3 and 4 is well adapted for use as a wrapper for various purposes since it possesses the protective bufiing qualities of the usual corrugated paper, and also possesses sufficient strength and toughess to enable the paper to withstand the severe wear to which it may be sub ected. Furthermore it may be bent and folded about an article to be wrapped much the same as ordinary wrapping paper to form a strong package having thick, yielding walls, and the reenforced, corrugated paper will not split or rupture during the wrapplng operation, as will the ordinary corru ated paper.

The reenforeed paper of Figs. 2, 3 and 4 is also well adapted for the formation of boxes as above stated, and in Fig. 1 a good form'of box that may be constructed of corrugated paper is shown. This box consists of an inner section 22 that may be inserted telescopicall into the outer box section 23, and each 0 these sections may be readlly made by bending a sheet of reenforeed corrugated paper to form the four walls of the section, and the ends of the paper may be secured together alon an edge of the box by a cloth strip 24. Tfie box sections of Fig. 1 are readily assembled by placing the outer section 23 over the inner section 22 as will be apparent from. Fig. 5, and while the corrugated paper of which the box sections are formed will necessarily have a facing sheet of reenforced paper secured to its outer face to protect and strengthen the same, it is not necessary that the inner face of the box sections be provided with a facing sheet.

What is claimed is:

1. A semi-stiff corrugated fabric that may be bent and folded without rupturing, comprising a corrugated sheet of paper, and a facing sheet of reenforced paper adhesively secured to the corrugated sheet and consisting of a two-ply sheet of paper reenforced by a set of substantially parallel unspun fibres extending transversely between the two sheets and a'second set of substantially parallel unspun fibres extending longitudinally between the two sheets and secured in place between the two sheets by an adhe- CHARLES H. HOWARD. 

